Digital Trunks: Digital Switched Service (DSS)

Configure Your Telecommunications System to New Demands Easily and Cost-Effectively

Fast, easy, and reliable analog and digital voice services over a digital transport.

Improving the quality of your voice services shouldn't require costly analog-to-digital conversion equipment. CenturyLink® Digital Switched Service (DSS) lets you deliver fast, easy, and reliable analog and digital voice services over a digital transport. Clear connections free of crosstalk, amplified noise, or distortion help you communicate effectively and show your business at its best for callers. The complete switched digital network solution includes a DS-1 facility, common equipment, local-exchange switching, and flat-usage trunks for access to the local exchange network, all fully customizable to meet your specific requirements. As your business needs grow, CenturyLink DSS gives you a practical and dependable way to upgrade your telecommunications capability while controlling your costs.


Provide Callers with a Clear Signal, Free of Crosstalk, Amplified Noise, and Distortion

Eliminate Costly Analog-to-Digital Conversion Equipment

Provide Increased Trunking Efficiencies with Two-Way DID

Meet Specific Business Needs with Customized Configured Trunks

Achieve Sub-Second Response Time with Nearly Error-Free Performance


Answer Supervision with Answer-Back Central Office Signaling to Identify When a PBX Call is Completed

Two-Way Data Trunks for Video Applications and 56 Kbps Data Transfer

Available Remote Local Area Network (LAN) Access

Can Be Provisioned on a DS-3 or Higher Transport

Advanced DSS with Direct Inward Dialing (DID) Services to Optimize Trunks and Bypass the Need for an Attendant

Direct DS-1 Interface to Your PBX

Basic DSS with Standard-Class CLASS and Line-Side Services Including Call Waiting, Call Forwarding, and Caller ID

How It Works

At the central office, the facility is multiplexed by a D4 multiplexer onto basic and/or advanced trunks and connects to the public switched telephone network (PSTN). With CenturyLink DSS, the DS-1 passes from the central office to the DS-1 interface to the channel service unit/data service unit (CSU/DSU) and then to the customer's digital PBX. Outbound caller ID does not work with DSS advanced trunks.

More Services and Solutions for You

Managed Office

Internet, voice and business applications—including Microsoft® Office 365—in one complete solution.

Hosted VoIP

Communicate faster and in more places without the expense of an onsite phone system.

Contact an Expert

Chat with Us

Chat with one of our online sales consultants:

Call Us

Call us for further assistance:


Email Us

Please provide the following contact information and we will follow up with you soon.
* - Denotes a required field.

Get Connected. See What's Next for Business.